How To Find Volume of Hemisphere in Java?

A hemisphere refers to the exact half of a sphere. Means if we divide a sphere in two equal parts then we will get two hemispheres. Hemisphere is a three-dimensional geometrical shape which has one flat face.

The amount of space occupied by the hemisphere is called the volume of the hemisphere.

Formula to calculate volume of hemisphere −

Mathematically it can be represented as

$$\mathrm{Volume \:=\: (2\pi\:r^2)/3}$$

Mathematically it can be represented as

Volume = (2 * pi * r * r) / 3

Where, ‘r’ refers to the radius of the hemisphere.

In this article we will see how we can find the volume of the hemisphere by using Java programming language.

To show you some instances

Instance-1

Suppose radius(r) of hemisphere is 4.5

Then by using volume formula of hemisphere

Volume = 190.851

Hence, the volume of hemisphere is 190.851

Instance-2

Suppose radius(r) of hemisphere is 3

Then by using volume formula of hemisphere

Volume = 56.548

Hence, the volume of hemisphere is 56.548

Instance-3

Suppose radius(r) of hemisphere is 6

Then by using volume formula of hemisphere

Volume = 452.389

Hence, the volume of hemisphere is 452.389

Syntax

In Java we have a predefined constant in Math class of java.lang package i.e. Math.PI which gives us the pie value which is approximately equal to 3.14159265359.

Following is the syntax for that

Math.PI

To get the power of any number raised to the power of another number in Java we have inbuilt java.lang.Math.pow() method.

Following is the syntax to get power of 2 by using the method −

double power = math.pow (inputValue,2)

Algorithm

• Step 1 − Get the radius of the hemisphere either by initialization or by user input.

• Step 2 − Find the volume of the hemisphere by using the volume formula.

• Step 3 − Print the result.

Multiple Approaches

We have provided the solution in different approaches.

• By Using Static Input

• By Using User Input

• By Using User Defined Method

Let’s see the program along with its output one by one.

Approach-1: By Using Static Input

In this approach, the radius value of the hemisphere will be initialized in the program. Then by using the algorithm we will find the volume.

Example

public class Main {
   //main method
   public static void main(String[] args) {

      //declared a double variable 'radius'
      //and initialized with radius value
      double radius = 6;

      //printing the given radius value of hemisphere
      System.out.println("Given radius of hemisphere : "+radius);

      //calculate volume by using formula
      double volume = (2 * Math.PI * radius * radius * radius) / 3;

      //print the result
      System.out.println("Volume of Hemisphere is : " + volume);
   }
}

Output

Given radius of hemisphere : 6.0
Volume of Hemisphere is : 452.3893421169302

Approach-2: By Using User Input Value

In this approach, the user will be asked to take the input of the radius value of the cone. Then by using the volume formula of the cone, find the volume. Here we will make use of the Java inbuilt pow() method.

Example

public class Main {
   //main method
   public static void main(String[] args) {

      //declared a double variable 'radius'
      //and initialized with radius value
      double radius = 5.5;

      //printing the given radius value of hemisphere
      System.out.println("Given radius of hemisphere : "+radius);

      //calculate volume by using formula
      double volume = (2 * Math.PI * Math.pow(radius,2) * radius) / 3;

      //print the result
      System.out.println("Volume of Hemisphere is : " + volume);
   }
}

Output

Given radius of hemisphere : 5.5
Volume of Hemisphere is : 348.45498516066795

Approach-3: By Using User Defined Method

In this approach, the radius value of the hemisphere will be initialized in the program. Then we call a user defined method to find the volume by passing the radius value of the hemisphere as a parameter. Then inside the method by using the volume formula of the, find the volume of the hemisphere.

Example

public class Main {
   //main method
   public static void main(String[] args) {

      //declared a double variable 'radius'
      //and initialized with radius value
      double radius = 5.5;

      //printing the given radius value of hemisphere
      System.out.println("Given radius of hemisphere : "+radius);

      //calling the method
      findVolume(radius);
   }

   //user defined method to find volume of hemisphere
   public static void findVolume(double radius) {

      //calculate volume by using formula
      double volume = (2 * Math.PI * Math.pow(radius,2) * radius) / 3;

      //print the result
      System.out.println("Volume of Hemisphere is : " + volume);
   }
}

Output

Given radius of hemisphere : 5.5
Volume of Hemisphere is : 348.45498516066795

In this article, we explored how to find the volume of a hemisphere in Java by using different approaches.

Mr. Satyabrata

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Updated on: 17-Nov-2022

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